Tack forming and driving die.



L. B. 611mm.y TACK FOBMING AMLDBIVING DIES. APPLIUATIOF ITILBD 00T.- 17, 1908.

'95 SAI 6. y VPatented Mar. 29,-1910.

` 2 SHEETS-SHEET 2.

v y2o shear the tack ,the parts in the position they have at the 'tlme the tack 1s driven. Fig. l3 is a section it 'rn s'rnwnn'r nrc LOUISl B. GIRARD, 0F LOS ANGELES, CALIFORNIA, AS'SIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO- THE GIRARD MANUFACTURING COMPANY, OF LOS ANGELES, CALIFORNIA, A .CORPORATION `OE CALIFORNIA.

Tacx rom/:ING AND DRIVING DIE.

Specification of Letters Patent.

Patented Mar. 29, 1910.

Application filed October 17, 1908." Serial No. 458,284.

To all whom 'it may concern:

Be it known that I, LOUIS B. GIRARD, a

citizen of the United States, residing at Los Angeles, in the countyof Los Angeles and State of California, haveinvented new and This invention relates to dies which are adapted to form a tack or-staple from a strip of sheet metal and drive the same. i The dies are especially' designed for forming tacks for fastening window shade rollers, the dies acting to drive the tack as soon as it is formed to fasten the window shade to the roller, but while especially adapted for this purpose they may-also be used for forming tacks used forother purposes.`

and driving The dies are also adapted .to be used merely informing the tack should the tack driving function not be required.

Otherobjects and advantages of the invention willappear in the following-descrip-l tion. l

Referring 'to vthe drawings :-Figure 1 is a side elevation of the device with the dies partly in section. The parts a e shown in the position the have when just about to om the strip and drive it through the window shade into the roller;

Fig. 2 is a view similar to'Fig. 1 showing on line zusm8 Fig. 1, showing the contour of the female die and showing the contour and relative location of 'the'rst male die in dotted lines. Fi 4 is a.l section online :vY- Fig. 2, an shows thatortion of the first male die in section whic has formed the back prongs of the tack. The second die 1s also shown in section and its longitudinal groove is seen. Fig. 5' is'- a section on line m5- Fig. 4. Fig'.'6is a perspective view of the'rst die. F1g. 7 is a perspective view ofthe second die'. Fig. 8 1s a perspective View of the first die inverted to show the construction of its lowerA end'. Fig. 9 -is a i pers ective view of the second die inverted tack formed thereon but not yet severed dog 28 havlng a y p 30. Slidable on the gulde 26 1s. a bracket 31 to'which is pivoted a dog 32s1m1lar to the therefrom. Fig. 13 is a perspective view of the iinished tack.

1 designates a table having a groove 2 1n which is-laid the shade roller 3, the shade 5 which is to be attached to the roller having been placed in'position over' the top of the roller, as indicated.

The' mechanism which performs the forming and tacking operation is carried by'an -arm 6 which is journaled on shaft 6 so" that the device may be swung up out of the `way to enable the shade roller tobe easily placed in position or removed from the groove 2. Cast on .the-lower end of the arm 6 are two vertical guides 7 and a foot 8.` A supporting screw 9 passes throu h the foot 8 to act as a leg for supportin t e device the proper distance above the s ade holder.. This screw may be operated to v raise or lower the device, to the desired height and is prevented from accidentally turning by 'means of a lock hut 10. An arm 11 is also cast integrally wlthvthe arm 6,

and pivoted thereto by a screw 12 is an upper rock arm 13. vAn operating arm 14 1s pivoted at 15 to the arm4 6 and operates the upper arm 13 by a link 16, arms 13 and 14 having several rforations 17' to enable .ad justment of lin 16 to produce the desired ratio of stroke between the arm 14 and arm 13. The arm 14 ma be operated from any.

suitable source o ower, not shown, through the medium o a connecting rod 18. Slidable between the two guides 7 1s a rst die 19 and a second die 20. The second dle v20 isoperated v:from the upper arm 13' .by a link 21, while the first die 19 1s` actuated from he bperating arm 14 by a link 22.

' yA side plate 23 is fastenedv by screws 24 tothe u Guide the dies 19 and 20. A femaledie 25 1sl guides 7 and serves to confine and secured below the guides 7. The specific construction of the dies is shownyin .detail in Figs. 3 to 10 and will be described later.

'Y A stationary guide 26 extends rearwardly, and secured to the rear end thereof 1s a stationary bracket 27l to whichispivoted a face 29 eccentric to its plvot dog 28. v

A sleeve 33 is mountedonthe arm v6, and

"ournaled in sleeve 33 is a lshaft 34 to one end 'of lwhich is keyed an`arm 35 havlng a slot 36 int which projects a pin 37 which pin also pivotally connects the upper end of link 22 to arm 14. On the opposlte side of arm 6 an arm 38 is keyed to the shaft 34 and the lower end of arm 38 is forked`to straddle a screw 39 which rojects from. the slidable bracket 31, there eing a compression springl 40 between arm 38 andbracket 31 anda nut 41 on the screw on the opposite side of the arm. n

42 designates the blank strip of sheet metal from which the tacks are formed, which strip, as clearly shown in Fig. 2, passes through the brackets 27 and 31 under the dogs 28 and 32.v As the arm 14 is.

actuated it operates the dies 19 and 20, as will be described, and also actuates rock arm 35 whichin turn swings arm 38 to the vright as the arm 14 moves down, thereby sliding the bracket 31 to the right, the do 32 freely sliding over the blank strip o metal 42 which is prevented from moving vrearwardly bythe dog 29. Upon the return stroke of operating arm 14 the bracket 31 slides to the left and the dog .32 grips the blank strip 42 and shifts the latter to the left, thus feeding the 'strip under the dies. When'the end of the strip strikes the die and arrives at the position shown in Fig. 1, it is positively stopped, and any eX- cessive movement ofthe arm 38 to the left will simply compress s ring 40 so that no damage 1s caused any o the parts. This enables the stroke of the arm 38 to be made a triie greater'than necessary to insure that the strip 42 will be moved suficiently to the left even lthough the dog 32 might occasionally slip a trifle'or failJ to catch at .the exact moment. A. in-43 on the guide 26 limits the movement o the bracket 31 to the right.

The completed tack, as shown in Fig. 13, consists of a flat body portion 44 with a single down-turned Afront spur 45 and two rear down-turned spurs 46 there being a V- shaped notch 47 between the rear spurs 46 \and a shoulder 48 between each spur 46 and .the notch 47. At the front there are two shoulders 49 on each side of the spur 45.

The first operation is performed by the first die, the downward stroke of the'die stamp- 1ng and bending down the rear spurs 46 and producing the V-shaped cut at 50 for the spur 45, but not, however, cutting the blank at the shoulders 48 so` that, although the tack is partially separated from the blank 42 by the cut 50, vit isy still connected with the blank by the small amount of uncut metal at the shoulders 48. The formation of the rear s urs 46 leaves the beveled edges 51. To prodiice this first operation the rst die 19 has two wings 52 with shoulders 53 which latter shear the blank 42 at 51 and as the -die 19 -moves down the shoulders 53- 'bend down the rear spurs 46. The end of the blank being operated on lies in a groove f @sans 54 in the female die 25 and the spurs 46 are'- bent down through openings 55. The levers and links which' operate thetwo dies 19 andl 20 are so proportioned that the second die 20 has a longer stroke and moves faster than the first die 19 and they are so adjusted that during the downward stroke of the operating down the front spur 45 and at the same time shearing the previously made tack at shoulders48. The second die 20 has a longitudinal groove 56 and cutting edges 57, also a concave bottom 58 so that as the second die 20 descends the bottom edge 59 of groove 56 bends over the frontfspur 45 and the groove 56 then slides down over the spur 45,

the cutting edges 57 meanwhile severlng the previously formed tack at the shoulders 48. During the down stroke the dog 32 has been retracted so that during the up stroke of the dies the strip 42 is fed forward in the manner previously described. The female die' 25- has two notches 60, as shown in Fig. 5,

on each side of the bridge 61, through which notches 60 the down turned spurs 46 pass as the stri 'is advanced so that the forward feeding o the strip is not interfered with. During the up stroke of the dies the strip is advanced until the down turned spur 45 strikes the edge 62 of the female die where it is arrested. Any further movement of the arm acts merely to compress spring 40. Upon the down stroke of the dies the first die acts on the strip in 'the manner previously described, while the second die 20 bends, `down the prong 45 over a slightly rounded edge 63 formed on the bridge 61 and severs the tack at shoulders 48 by means of the cutting edges 57, and the continued downward stroke of the 'second' die 20 pushes the completed tack down through the female die and forces it through the shade 5 into the shade roller 3, the concave bottom 58 of the die substantially conformin to the curvature of the shade roller so t at the tack is curved to fit the roller and presents a very smooth surface. l 4 v A very important advantage of this device is that the shade roller does not require a groove to enablethe tack to be properly drlven for the reason that the prongs of the tack are confined by the female die 25 and the prongs are thus prevented from spreading at the surface of the roller before they enter the` wood, and as they are compelled' No. 735,540 or 553,407, is driven, it is necessary to groove the roller so that the prongs of the tack will not slip.

What I claim is l. In va device of the character described a first die provided with two parallel wings 52, the inner walls of which are in diverging vertical planes, each wing 52 having a shoulder 53 which slopes upwardly and rearwardly at an angle to the edge of the wing, the upper portion of the shoulder being wider than the lower portion, said die having a wide shoulder at the rear of said Wings, the Wideshoulder lying in a plane above the shoulders on said wings, said die having a V-shaped cutting edge 53a located between said wings and above the first two shoulders,

ya second die and means for producing cooperation of said dies.

2. In a device of the character described a second die having a concave end 58 which is transverse of the die and formed with a longitudinal groove 56 which terminates at one side of the concave end, thereby forming a pairof opposite cutting edges 57, said die also having cutaway portions on opposite sides thereof ateach end of the concave poi'- tion another die, and means for producing cooperation of said dies.

3. In a device of the character described -a female die having a groove 54 for guiding In testimony whereof, I have hereunto set my hand at Los' Angeles, California, this 10th day of October 1908.

v LOUIS B. GIRARD. In presence of- G. T. HACKLEY, FRANK L. A. GRAHAM. 

